numpy.alen() in Python (original) (raw)

Last Updated : 28 Dec, 2018

**numpy.alen() **function is used to return the length of the first dimension of the input array.

Syntax : numpy.alen(arr)

Parameters :
arr : [array_like] Input array.

Return : [int]Length of the first dimension of arr.

Code #1 :

import numpy as geek

in_arr = geek.array([[ 2 , 0 , 7 ], [ 0 , 5 , 9 ]])

print ( "Input array : " , in_arr)

out_dim = geek.alen(in_arr)

print ( "Length of the first dimension of arr: " , out_dim)

Output:

Input array : [[2, 0, 7], [0, 5, 9]] Length of the first dimension of arr: 2

Code #2 :

import numpy as geek

in_arr = geek.arange( 9 ).reshape( 1 , 3 , 3 )

print ( "Input array : \n" , in_arr)

out_dim = geek.alen(in_arr)

print ( "Length of the first dimension of arr: " , out_dim)

Output:

Input array : [[[0 1 2] [3 4 5] [6 7 8]]] Length of the first dimension of arr: 1